When checking your brakes and suspension system during a pre-trip inspection, which statement is true?

The statement that brake shoes must be free of oil, grease, or brake fluid is true because any contamination on the brake shoes can significantly impair their functionality. When oil, grease, or brake fluid is present, it reduces the friction necessary for the brakes to operate effectively, which can lead to decreased stopping power and increased stopping distance. This contamination can result from leaks in various vehicle systems or improper maintenance practices. Ensuring that brake shoes are clean and uncontaminated is crucial for maintaining safe braking performance.

The other statements present misconceptions or inaccuracies regarding safety standards and vehicle maintenance. For instance, a missing leaf spring can compromise the integrity of the suspension, leading to instability and unsafe driving conditions. Cracked spring hangers, even if they seem tight, can be indicative of a structural failure that may worsen over time and could lead to severe consequences if not addressed. Additionally, assuming that the brake system requires no inspection if there is no visible damage overlooks the potential for internal failures or performance issues that could arise without apparent external signs. Regular inspection of all components of the brake and suspension systems is essential to ensure the overall safety of the vehicle.